The Volt is a technological wonder, combining emission-free electric driving with the ability to drive hundreds of miles using gasoline. But if you're just looking to save gas money, buy something else.

Volts are in tight supply so dealers are getting top dollar for them. Even after the special tax rebates, it'll be a long time before you save enough in fuel costs to make up for the extra money you spent compared to, say, a Chevy Cruze Eco.